EP0684799B1 - Verfahren und abscheider zum trennen transportierender saugluft von einem transportierten medium - Google Patents

Verfahren und abscheider zum trennen transportierender saugluft von einem transportierten medium Download PDF

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Publication number
EP0684799B1
EP0684799B1 EP94906088A EP94906088A EP0684799B1 EP 0684799 B1 EP0684799 B1 EP 0684799B1 EP 94906088 A EP94906088 A EP 94906088A EP 94906088 A EP94906088 A EP 94906088A EP 0684799 B1 EP0684799 B1 EP 0684799B1
Authority
EP
European Patent Office
Prior art keywords
separator
discharge element
housing
suction air
outlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94906088A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0684799A1 (de
Inventor
Werner Trawöger
Bruno Pregenzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AT0030493A external-priority patent/AT399453B/de
Priority claimed from AT0045293A external-priority patent/AT399454B/de
Priority claimed from AT0130493A external-priority patent/AT399456B/de
Priority claimed from AT0234993A external-priority patent/AT400512B/de
Application filed by Individual filed Critical Individual
Publication of EP0684799A1 publication Critical patent/EP0684799A1/de
Application granted granted Critical
Publication of EP0684799B1 publication Critical patent/EP0684799B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/06—Saliva removers; Accessories therefor
    • A61C17/065—Saliva removers; Accessories therefor characterised by provisions for processing the collected matter, e.g. for separating solids or air

Definitions

  • the invention relates to a method and a separator for separating transporting suction air from a transported flowable medium, in particular from a dental liquid-solid mixture sucked out of the mouth of a patient, according to the preamble of patent claims 1 and 2.
  • Such a separator is described in EP-A 432 142.
  • the solids are separated together into a collecting container by means of a centrifuge from two different solid-liquid mixtures, one of which comes from the bowl and the other from the suction device.
  • the mixture is discharged from the vacuum region by means of an impeller pump, the housing of which has an outlet opening in the peripheral wall, which is provided with a check valve.
  • the impeller pump conveys a mixture from which substantial solids have already been sedimented beforehand, so that the mixture emerging through the outlet opening contains only a few solids and the outlet opening need not be too large.
  • a separator is known from DE-C 38 04 299, the housing of which has a negative pressure range and a normal pressure range.
  • a full jacket centrifuge overlaps the two different pressure ranges and is provided with an inward-facing locking flange on the upper edge in the normal pressure range.
  • a collecting container is attached to the funnel-shaped bottom of the centrifuge in the vacuum region, from which a water ring rises when the centrifuge is switched on and lies against the cylindrical jacket.
  • a hollow cylindrical rotating part driven by the centrifuge has inner wings and an outwardly directed separating flange. The upper end region of the hollow cylindrical rotating part is in a Housing arranged seal ring mounted.
  • the raised water ring in which the separating flange is immersed, forms a co-rotating non-return valve in the area of the annular gap.
  • the object of the invention is therefore to improve a separator of the type mentioned at the outset and to make it as simple and space-saving as possible, the non-return valve being provided without constant rotation. Accordingly, in a method according to the invention, the medium accelerated by the rotation is pressed outwards on all sides by an annular non-return valve which is acted against in the direction of discharge.
  • the outlet for the flowable medium and the non-return valve acted upon in the closing direction are arranged in a ring around the discharge element for this purpose.
  • the non-return valve is preferably formed by a check valve arrangement which has a carrier, a carrier arranged on the carrier and bridging the outlet Has valve element and a contact element arranged on the other side of the outlet.
  • a first operating state when the discharge element is at a standstill, the suction system is switched on and the check valve arrangement is therefore additionally acted upon by the negative pressure of the suction pump, so that an air inlet from the outer normal pressure range is reliably prevented.
  • This additional loading is also effective in a second operating state in which the discharge element is driven. If mixture is supplied, this is accelerated radially and pressed outward through the check valve arrangement.
  • the suction system can be switched off and the discharge element can still be in operation if, for example, a mixture coming from a bowl that does not contain any suction air is to be passed through the discharge element.
  • the valve's own closing action ensures that the material has to press open the check valve arrangement. This at least low, valve-specific closing action is necessary so that air from the normal pressure range does not enter when the suction system is switched on.
  • the separator according to the invention can fully fulfill its function in all three operating states. Only the passage of the liquid-solid mixture accelerated by the rotation opens the non-return valve, which closes again after the mixture has passed.
  • the medium escaping into an annular space of the housing under normal pressure flows down there under the effect of gravity.
  • the lower part of the normal pressure range is preferably funnel-shaped, so that a connection piece protruding over the circumference of the housing is avoided.
  • the check valve arrangement comprises, in particular, a valve lip or the like which surrounds the discharge element and which is made of an elastic material and which can be inserted into the carrier, clamped, articulated or, with a suitable selection of the material of the carrier, can also be formed on the carrier via a tapered peripheral region.
  • the valve lip is preferably designed as a frustoconical or cylindrical sealing web, which is expanded due to its elasticity when the separated medium exits.
  • the sealing web is preferably supported on the outside by a support web made of, in particular, elastic material. The two webs can therefore also be formed on a one-piece ring body which is inserted into or molded onto the carrier.
  • the outlet and the check valve arrangement can also comprise sections distributed evenly over the circumference, so that a plurality of small valve flaps are provided at a plurality of passage openings, each of which is acted upon by a spring from the outside against the contact element.
  • the outlet and the check valve arrangement are arranged in a partition wall surrounding the driven discharge element and fixed to the housing.
  • the check valve arrangement is stationary in the partition, which is the negative pressure area divided from the normal pressure range and enclosing a cavity, the diameter of which increases towards the outlet.
  • the outlet and the check valve arrangement are arranged in the driven discharge element.
  • the centrifugal force counteracts the closing action, so that the passage of the mixture is facilitated.
  • the support web is preferably C-shaped and has its concave side facing outwards. When the discharge element rotates, this leads to a toggle lever effect due to the centrifugal force acting on the support web, since the outward curvature causes the contact pressure of the sealing web. If mixture is discharged, the C-shaped support web bends inwards, air being able to escape from the space between the web and the support web through at least one hole in the support web.
  • the space is not open to the outside but to the inside through a channel into the vacuum area, so that a vacuum is also generated in this room.
  • the channel preferably has a small cross section and is optionally angled several times in order to achieve a negative pressure difference which has proven to be advantageous for the exact function.
  • valve lip or the valve flaps can be slightly inclined against a radial plane in such a way that their pressure against the contact element is increased during rotation.
  • the valve lip or the valve flaps can be provided on the driven discharge part and rest on a sealing surface of the contact element fixed to the housing.
  • the valve lip or the valve flaps it is also conceivable to arrange the valve lip or the valve flaps on the partition fixed to the housing and to provide the sealing surface on the driven discharge part.
  • the outlet can then be provided with the largest diameter in the form of an exit ring gap. This results in a maximum opening cross section of the outlet.
  • the discharge element can also be provided on the hub of a centrifuge container which is arranged in the normal pressure range. In this embodiment, the outlet is then formed by an entry ring gap in which the co-rotating check valve arrangement is provided. If the check valve arrangement is provided stationary in the partition fixed to the housing, the driven discharge element can be limited to an impeller or the like, the blades of which have a convex outer contour.
  • the seal arranged between the housing and the discharge element has at least one sliding element which is elastically supported on the housing and is acted upon against the discharge element.
  • the two functions of a sliding seal are thereby divided and a sliding bearing made of a particularly suitable material can be used as the sliding element, which is acted upon by an element made of elastic material.
  • the housing has a central suction air outlet pipe, possibly penetrated by the drive shaft of the discharge element, which is surrounded by a mixture inlet chamber, which is guided in particular in a spiral manner.
  • a mixture inlet chamber which is guided in particular in a spiral manner.
  • a second sliding seal is formed between the suction air outlet pipe and the guide flange and has a second sliding element which is elastically supported on the housing. The second sliding seal avoids the immediate one Passage of the suction air from the mixture inlet space into the suction air outlet pipe.
  • the or each sliding seal has, in particular, sealing surfaces lying in a radial plane.
  • a sliding element a ring made of a low-friction material can be used, which is arranged in a carrier suspended elastically on the housing. Suitable material is, for example, polytetrafluoroethylene, ceramic, etc., and the sealing surface rotating with the central joint container can be provided on a metal ring. In the preferred embodiment with two mechanical seals, these are advantageously suspended from a common support which has the suction air outlet pipe.
  • elastic suspension of this embodiment of the carrier for example, elastic rings holding the carrier on the housing are provided, and the elastic action against the centrifuge container is preferably carried out by means of prestressed compression springs which are supported between the housing and the carrier.
  • a separator has a housing 1, which comprises a vacuum region 6 and a normal pressure region 7, and in which a discharge element 4, driven by a motor 2 and in particular formed by a centrifuge container, is arranged as a separating element for the two regions 6, 7.
  • a mixture inlet 8 for flowable medium for example a liquid-solid mixture to be sucked out of the mouth of a patient, opens into the vacuum region 6, the separated suction air being directed via a central air outlet 9 to a vacuum source, not shown, in particular a suction pump.
  • the centrifuge container has a hub 13 arranged on the drive shaft 3 of the motor 2, from which a plurality of support webs 14 project in axial planes.
  • the outlet 5 is a co-rotating non-return valve in the form of a check valve arrangement 10, for example an annular lip, flap, apron or similar valve flap biased against a contact surface, which flap is additionally acted upon by the negative pressure in the closed position when the suction pump is working.
  • a check valve arrangement 10 for example an annular lip, flap, apron or similar valve flap biased against a contact surface, which flap is additionally acted upon by the negative pressure in the closed position when the suction pump is working.
  • the mixture pressed through the check valve arrangement 10 flows downwards on all sides under the force of gravity, so that an extremely compact arrangement is achieved since no outflow channel protruding laterally beyond the housing 1 is required.
  • the diameter of the housing is thus limited to the diameter of the discharge element 4 plus the surrounding annular collecting space 29 of the normal pressure region 7.
  • the outlet 5 is formed at the largest diameter of the discharge element 4 between a first, lower container section 26, which extends like a pot from the hub 13, and a second, upper container section 11.
  • a first, lower container section 26 which extends like a pot from the hub 13, and a second, upper container section 11.
  • the annular valve lip, valve flap or the like At the largest circumference of the pot-like container section 26 is the annular valve lip, valve flap or the like. made of elastic material, whose Outer edge area bears against the lower edge of the second, upper container section 11, which widens towards the valve lip, valve flap.
  • a flange-like section 12 which has additional air guide vanes and is also fixed to the support webs 14, serves as the guide surface and partition wall against the central air outlet.
  • the mixture supplied via the mixture inlet 8 is excellently segregated due to the rotation of the discharge element 4, the flowable medium, in particular containing solids, being pressed against the valve lip or valve flap which thereby opens and allows the flowable medium to exit into the normal pressure range 7.
  • the lighter and much lower centrifugal air is sucked in via the separating container section 12 inwards to the air outlet 9, the vacuum generated by the suction pump keeping the valve lip or valve flap closed until it is pressed open by a sufficient amount of flowable medium.
  • seals 15 are provided which, on the one hand, seal the vacuum region 6 against the normal pressure region 7 and, on the other hand, the direct passage from the mixture inlet 8 to the air outlet 9.
  • a second centrifuge 17 (FIG. 2, 3) is preferably provided in dental separators, which is also driven by the motor 2 and which can be used to feed the outflow of a bowl through a further mixture inlet 16.
  • the centrifuge 17 separates the contained solids from the liquid in a known manner, which leaves the centrifuge via a liquid outlet 18.
  • FIG. 2 shows an embodiment in which the discharge element 4 is provided at the entrance to the centrifuge 17 located in the normal pressure range 7.
  • the outlet 5 from the vacuum area 6 into the normal pressure area 7 is an inlet ring gap in the centrifuge 17 is provided between the hub 13, which has an outwardly leading guide surface, and the container section 11 serving as discharge element 4, which in turn is connected to the hub 13 via the support webs 14.
  • the container section 11 carries the check valve arrangement 10, which in turn is formed by the annular valve lip or valve flap made of elastic material, and the seal 15 to the housing 1.
  • deflection surfaces 19 are provided for better separation of the mixture entering tangentially via the mixture inlet 8, which produce a cyclone effect, so that the separated air can be sucked off via the air outlet 9, while the flowable medium flows down along the inner wall of the housing 1 to the outlet 5.
  • an impeller 20 is also attached to the drive shaft 3, which separates residues of the flowable medium and, if appropriate, also destroys foam. These portions of the flowable medium flow down through openings 21.
  • the outlet 5 is again provided at the largest diameter of the discharge element 4 and is formed by the outlet annular gap 22 between the two container sections 26, 11.
  • the annular valve lip or valve flap made of elastic material extends approximately in a radial plane between the pot-like lower container section 26 and the lid-like upper container section 11, and in this embodiment is thus printed upwards by the material to be discharged.
  • the mixture inlet 8 is arranged centrally above the discharge element 4, and is surrounded by the annular air outlet 9. As a result, instead of the two seals 15 in FIGS. 1 and 2, only a single seal between the housing 1 and the upper rotating part 11 is necessary.
  • the flange-like air deflecting surface 19 is fixed to the housing and extends from above into the discharge element 4, the two container sections 26, 11 of which, by means of screws 27 or the like. are connected.
  • the edge regions 28 of the support webs 14 adjoining the air deflecting surface 19 consist of a soft elastic material.
  • the check valve arrangement 10 has a frustoconical sealing web 31 made of an elastic material, for example an elastomer, which extends obliquely outwards and is fixed to the lid-like, upper container section 11. The outer edge of the sealing web 31 forms a sealing lip 34 which presses against a contact surface on the lower container section 11.
  • An approximately C-shaped, with its concave side facing outward support web 32 which, of course, is also subject to the centrifugal force when the discharge element 4 rotates, acts in a similar way to a toggle lever in that it presses more intensively on the sealing web 31 during the rotation, so that despite the centrifugal forces, the Sealing web 31 of the mixture to be discharged must be pressed.
  • the support web 32 is also fixed in the second container section 11, so that a space is enclosed between the sealing web 31 and the support web 32, which changes as the webs 31, 32 move.
  • the sealing web 31 can move to a limited extent, thereby preventing the mixture from adhering. Therefore, no material can build up in the exit ring gap 22, which could close the outlet 5.
  • the space 37 between the webs 31, 32 is ventilated to the outside, since the support web 32 has holes 33, so that air can enter and exit when the space 37 changes.
  • the space designated here by 38 is connected to the negative pressure region via a channel 36, so that the change in volume is also not hindered.
  • the negative pressure counteracts the centrifugal force present on the C-shaped support web, so that the closing force amplification of the web 31 or its sealing lip 34 is lower.
  • the support web 32 prevents the web 31 due to excessive suction pressure could be turned inside.
  • 5 is provided on an insert part, which can also consist of an elastomer.
  • the seals 15 have sealing surfaces 45 lying in radial planes and are composed of ring-shaped sliding elements 47, a carrier 39 holding them, and the compression spring 43 acting against the discharge element 4 together, which are supported on the housing 1.
  • the slide rings 47 consist of a low-friction plastic, such as polytetrafluoroethylene, or of ceramic material, which are pressed against, in particular, metallic pressure rings of the discharge element 4.
  • the carrier 39 forms part of a central suction air outlet pipe 42 and separates a mixture inlet space 44 from the suction air outlet pipe 42.
  • the carrier 39 is suspended from the housing 1 by two elastic rings 40, 41, so that it is resiliently arranged in the axial direction and by the compression springs 39 the seals 15 can be pressed.
  • the elastic rings 40, 41 lie approximately in radial planes, the ring 40 being arranged in the partition between the mixture inlet space 44 and the suction air outlet pipe 42 and the ring 41 in the partition between the mixture inlet space 44 and the normal pressure region 7.
  • the outlet 5 running around the discharge element 4 is arranged between a partition 23 fixed to the housing and a base plate 24 which surround the discharge element 4.
  • the discharge element 4 has an outlet ring gap 22, which is delimited by the two container sections 26, 11 and has the largest diameter, which is directly covered by a valve lip of the check valve arrangement 10 which extends in the manner of an apron but does not rotate along with it.
  • a flowable medium which is separated from the suction air flow guided over deflection surfaces 19 of the container section 12 between the inlet 8 and the air outlet 9 is pressed outwards by the valve lip or valve apron, as shown in broken lines, so that the material can escape all the way into the normal pressure region 7.
  • a sealing bearing 25 is provided between the lower container section 26 of the driven discharge element 4 and the base plate 24 of the housing 1.
  • the check valve arrangement 10 is arranged fixed to the housing and bridges the outlet 5 between a partition 23 fixed to the housing and a cover plate 30.
  • the check valve arrangement 10 comprises an integral ring body clamped in the cover plate 30, which consists of a sealing web 31 and a Support web 32 is made. Since, in contrast to the embodiments according to FIGS. 4 and 5, the check valve arrangement 10 does not co-rotate but is fixed to the housing, the support web 32 in the embodiment according to FIG. 8 serves in particular to prevent the sealing web 31 from being sucked into the interior. Furthermore, the free end of the support web 32 also serves as a seal between the housing 1 and its upper part or the plug-in plate 30.
  • the driven discharge element 4 has support webs 14 projecting from the hub 13 and the lower section 26, which is limited to a ring Section 12 are held, which is mounted on the cover plate 30 via the sliding seal 15.
  • the support webs 14 have a convex outer contour, i. H. the largest diameter lies in the outlet 5 near the contact area of the sealing web 31 on the partition wall 23.
  • the supporting webs 14 can also be curved in a blade-like manner in any embodiment.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Centrifugal Separators (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • External Artificial Organs (AREA)
EP94906088A 1993-02-18 1994-02-17 Verfahren und abscheider zum trennen transportierender saugluft von einem transportierten medium Expired - Lifetime EP0684799B1 (de)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
AT0030493A AT399453B (de) 1993-02-18 1993-02-18 Verfahren zum trennen transportierender saugluft von einem transportierten, fliessfähigen medium und abscheider zur durchführung des verfahrens
AT304/93 1993-02-18
AT0045293A AT399454B (de) 1993-03-10 1993-03-10 Abscheider
AT452/93 1993-03-10
AT1304/93 1993-07-02
AT0130493A AT399456B (de) 1993-07-02 1993-07-02 Abscheider
AT2349/93 1993-11-19
AT0234993A AT400512B (de) 1993-11-19 1993-11-19 Abscheider
PCT/AT1994/000017 WO1994018903A1 (de) 1993-02-18 1994-02-17 Verfahren und abscheider zum trennen transportierender saugluft von einem transportierten medium

Publications (2)

Publication Number Publication Date
EP0684799A1 EP0684799A1 (de) 1995-12-06
EP0684799B1 true EP0684799B1 (de) 1997-07-23

Family

ID=27421178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94906088A Expired - Lifetime EP0684799B1 (de) 1993-02-18 1994-02-17 Verfahren und abscheider zum trennen transportierender saugluft von einem transportierten medium

Country Status (7)

Country Link
EP (1) EP0684799B1 (ja)
JP (1) JP3535160B2 (ja)
AT (1) ATE155664T1 (ja)
AU (1) AU5995694A (ja)
DE (2) DE9422058U1 (ja)
ES (1) ES2105637T3 (ja)
WO (1) WO1994018903A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405366B (de) 1997-05-05 1999-07-26 Pregenzer Bruno Absaugeinrichtung für ein fliessfähiges medium
DE29906470U1 (de) * 1999-04-12 1999-07-29 Konzett, Alfred, Patsch Austragelement für einen Zentrifugalabscheider
DE10220757B4 (de) * 2002-05-08 2004-06-24 Westfalia Separator Ag Zentrifuge, insbesondere Separator
AT524033B1 (de) * 2020-11-02 2022-02-15 Pregenzer Bruno Abscheider mit herausnehmbarem Zentrifugenbehälter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1293455C (en) * 1984-12-17 1991-12-24 Bruno Pregenzer Separator for dental suction systems
DE3737002C1 (en) * 1987-10-31 1989-01-26 Emda Device for precipitating fine particles of solids from waste water

Also Published As

Publication number Publication date
DE59403463D1 (de) 1997-09-04
JP3535160B2 (ja) 2004-06-07
DE9422058U1 (de) 1997-10-16
EP0684799A1 (de) 1995-12-06
ES2105637T3 (es) 1997-10-16
ATE155664T1 (de) 1997-08-15
JPH08507448A (ja) 1996-08-13
AU5995694A (en) 1994-09-14
WO1994018903A1 (de) 1994-09-01

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